arch/m32r/kernel/smpboot.c

   1 /*
   2  *  linux/arch/m32r/kernel/smpboot.c
   3  *    orig : i386 2.4.10
   4  *
   5  *  M32R SMP booting functions
   6  *
   7  *  Copyright (c) 2001, 2002, 2003  Hitoshi Yamamoto
   8  *
   9  *  Taken from i386 version.
  10  *        (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
  11  *        (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
  12  *
  13  *      Much of the core SMP work is based on previous work by Thomas Radke, to
  14  *      whom a great many thanks are extended.
  15  *
  16  *      Thanks to Intel for making available several different Pentium,
  17  *      Pentium Pro and Pentium-II/Xeon MP machines.
  18  *      Original development of Linux SMP code supported by Caldera.
  19  *
  20  *      This code is released under the GNU General Public License version 2 or
  21  *      later.
  22  *
  23  *      Fixes
  24  *              Felix Koop      :       NR_CPUS used properly
  25  *              Jose Renau      :       Handle single CPU case.
  26  *              Alan Cox        :       By repeated request
  27  *                                      8) - Total BogoMIP report.
  28  *              Greg Wright     :       Fix for kernel stacks panic.
  29  *              Erich Boleyn    :       MP v1.4 and additional changes.
  30  *      Matthias Sattler        :       Changes for 2.1 kernel map.
  31  *      Michel Lespinasse       :       Changes for 2.1 kernel map.
  32  *      Michael Chastain        :       Change trampoline.S to gnu as.
  33  *              Alan Cox        :       Dumb bug: 'B' step PPro's are fine
  34  *              Ingo Molnar     :       Added APIC timers, based on code
  35  *                                      from Jose Renau
  36  *              Ingo Molnar     :       various cleanups and rewrites
  37  *              Tigran Aivazian :       fixed "0.00 in /proc/uptime on SMP" bug.
  38  *      Maciej W. Rozycki       :       Bits for genuine 82489DX APICs
  39  *              Martin J. Bligh :       Added support for multi-quad systems
  40  */
  41
  42 #include <linux/config.h>
  43 #include <linux/init.h>
  44 #include <linux/mm.h>
  45 #include <linux/smp_lock.h>
  46 #include <linux/irq.h>
  47 #include <linux/bootmem.h>
  48 #include <linux/delay.h>
  49
  50 #include <asm/io.h>
  51 #include <asm/pgalloc.h>
  52 #include <asm/tlbflush.h>
  53
  54 #define DEBUG_SMP
  55 #ifdef DEBUG_SMP
  56 #define Dprintk(x...) printk(x)
  57 #else
  58 #define Dprintk(x...)
  59 #endif
  60
  61 extern cpumask_t cpu_initialized;
  62
  63 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
  64 /* Data structures and variables                                             */
  65 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
  66
  67 /* Processor that is doing the boot up */
  68 static unsigned int bsp_phys_id = -1;
  69
  70 /* Bitmask of physically existing CPUs */
  71 physid_mask_t phys_cpu_present_map;
  72
  73 /* Bitmask of currently online CPUs */
  74 cpumask_t cpu_online_map;
  75
  76 cpumask_t cpu_bootout_map;
  77 cpumask_t cpu_bootin_map;
  78 cpumask_t cpu_callout_map;
  79 static cpumask_t cpu_callin_map;
  80
  81 /* Per CPU bogomips and other parameters */
  82 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
  83
  84 static int cpucount;
  85 static cpumask_t smp_commenced_mask;
  86
  87 extern struct {
  88         void * spi;
  89         unsigned short ss;
  90 } stack_start;
  91
  92 /* which physical physical ID maps to which logical CPU number */
  93 static volatile int physid_2_cpu[NR_CPUS];
  94 #define physid_to_cpu(physid)   physid_2_cpu[physid]
  95
  96 /* which logical CPU number maps to which physical ID */
  97 volatile int cpu_2_physid[NR_CPUS];
  98
  99 DEFINE_PER_CPU(int, prof_multiplier) = 1;
 100 DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
 101 DEFINE_PER_CPU(int, prof_counter) = 1;
 102
 103 spinlock_t ipi_lock[NR_IPIS];
 104
 105 static unsigned int calibration_result;
 106
 107 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 108 /* Function Prototypes                                                       */
 109 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 110
 111 void smp_prepare_boot_cpu(void);
 112 void smp_prepare_cpus(unsigned int);
 113 static void smp_tune_scheduling(void);
 114 static void init_ipi_lock(void);
 115 static void do_boot_cpu(int);
 116 int __cpu_up(unsigned int);
 117 void smp_cpus_done(unsigned int);
 118
 119 int start_secondary(void *);
 120 static void smp_callin(void);
 121 static void smp_online(void);
 122
 123 static void show_mp_info(int);
 124 static void smp_store_cpu_info(int);
 125 static void show_cpu_info(int);
 126 int setup_profiling_timer(unsigned int);
 127 static void init_cpu_to_physid(void);
 128 static void map_cpu_to_physid(int, int);
 129 static void unmap_cpu_to_physid(int, int);
 130
 131 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 132 /* Boot up APs Routins : BSP                                                 */
 133 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 134 void __devinit smp_prepare_boot_cpu(void)
 135 {
 136         bsp_phys_id = hard_smp_processor_id();
 137         physid_set(bsp_phys_id, phys_cpu_present_map);
 138         cpu_set(0, cpu_online_map);     /* BSP's cpu_id == 0 */
 139         cpu_set(0, cpu_callout_map);
 140         cpu_set(0, cpu_callin_map);
 141
 142         /*
 143          * Initialize the logical to physical CPU number mapping
 144          */
 145         init_cpu_to_physid();
 146         map_cpu_to_physid(0, bsp_phys_id);
 147         current_thread_info()->cpu = 0;
 148 }
 149
 150 /*==========================================================================*
 151  * Name:         smp_prepare_cpus (old smp_boot_cpus)
 152  *
 153  * Description:  This routine boot up APs.
 154  *
 155  * Born on Date: 2002.02.05
 156  *
 157  * Arguments:    NONE
 158  *
 159  * Returns:      void (cannot fail)
 160  *
 161  * Modification log:
 162  * Date       Who Description
 163  * ---------- --- --------------------------------------------------------
 164  * 2003-06-24 hy  modify for linux-2.5.69
 165  *
 166  *==========================================================================*/
 167 void __init smp_prepare_cpus(unsigned int max_cpus)
 168 {
 169         int phys_id;
 170         unsigned long nr_cpu;
 171
 172         nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
 173         if (nr_cpu > NR_CPUS) {
 174                 printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
 175                         nr_cpu, NR_CPUS);
 176                 goto smp_done;
 177         }
 178         for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
 179                 physid_set(phys_id, phys_cpu_present_map);
 180
 181         show_mp_info(nr_cpu);
 182
 183         init_ipi_lock();
 184
 185         /*
 186          * Setup boot CPU information
 187          */
 188         smp_store_cpu_info(0); /* Final full version of the data */
 189         smp_tune_scheduling();
 190
 191         /*
 192          * If SMP should be disabled, then really disable it!
 193          */
 194         if (!max_cpus) {
 195                 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
 196                 goto smp_done;
 197         }
 198
 199         /*
 200          * Now scan the CPU present map and fire up the other CPUs.
 201          */
 202         Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
 203
 204         for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
 205                 /*
 206                  * Don't even attempt to start the boot CPU!
 207                  */
 208                 if (phys_id == bsp_phys_id)
 209                         continue;
 210
 211                 if (!physid_isset(phys_id, phys_cpu_present_map))
 212                         continue;
 213
 214                 if ((max_cpus >= 0) && (max_cpus <= cpucount + 1))
 215                         continue;
 216
 217                 do_boot_cpu(phys_id);
 218
 219                 /*
 220                  * Make sure we unmap all failed CPUs
 221                  */
 222                 if (physid_to_cpu(phys_id) == -1) {
 223                         physid_clear(phys_id, phys_cpu_present_map);
 224                         printk("phys CPU#%d not responding - " \
 225                                 "cannot use it.\n", phys_id);
 226                 }
 227         }
 228
 229 smp_done:
 230         Dprintk("Boot done.\n");
 231 }
 232
 233 static void __init smp_tune_scheduling(void)
 234 {
 235         /* Nothing to do. */
 236 }
 237
 238 /*
 239  * init_ipi_lock : Initialize IPI locks.
 240  */
 241 static void __init init_ipi_lock(void)
 242 {
 243         int ipi;
 244
 245         for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
 246                 spin_lock_init(&ipi_lock[ipi]);
 247 }
 248
 249 /*==========================================================================*
 250  * Name:         do_boot_cpu
 251  *
 252  * Description:  This routine boot up one AP.
 253  *
 254  * Born on Date: 2002.02.05
 255  *
 256  * Arguments:    phys_id - Target CPU physical ID
 257  *
 258  * Returns:      void (cannot fail)
 259  *
 260  * Modification log:
 261  * Date       Who Description
 262  * ---------- --- --------------------------------------------------------
 263  * 2003-06-24 hy  modify for linux-2.5.69
 264  *
 265  *==========================================================================*/
 266 static void __init do_boot_cpu(int phys_id)
 267 {
 268         struct task_struct *idle;
 269         unsigned long send_status, boot_status;
 270         int timeout, cpu_id;
 271
 272         cpu_id = ++cpucount;
 273
 274         /*
 275          * We can't use kernel_thread since we must avoid to
 276          * reschedule the child.
 277          */
 278         idle = fork_idle(cpu_id);
 279         if (IS_ERR(idle))
 280                 panic("failed fork for CPU#%d.", cpu_id);
 281
 282         idle->thread.lr = (unsigned long)start_secondary;
 283
 284         map_cpu_to_physid(cpu_id, phys_id);
 285
 286         /* So we see what's up   */
 287         printk("Booting processor %d/%d\n", phys_id, cpu_id);
 288         stack_start.spi = (void *)idle->thread.sp;
 289         task_thread_info(idle)->cpu = cpu_id;
 290
 291         /*
 292          * Send Startup IPI
 293          *   1.IPI received by CPU#(phys_id).
 294          *   2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
 295          *   3.CPU#(phys_id) enter start_secondary()
 296          */
 297         send_status = 0;
 298         boot_status = 0;
 299
 300         cpu_set(phys_id, cpu_bootout_map);
 301
 302         /* Send Startup IPI */
 303         send_IPI_mask_phys(cpumask_of_cpu(phys_id), CPU_BOOT_IPI, 0);
 304
 305         Dprintk("Waiting for send to finish...\n");
 306         timeout = 0;
 307
 308         /* Wait 100[ms] */
 309         do {
 310                 Dprintk("+");
 311                 udelay(1000);
 312                 send_status = !cpu_isset(phys_id, cpu_bootin_map);
 313         } while (send_status && (timeout++ < 100));
 314
 315         Dprintk("After Startup.\n");
 316
 317         if (!send_status) {
 318                 /*
 319                  * allow APs to start initializing.
 320                  */
 321                 Dprintk("Before Callout %d.\n", cpu_id);
 322                 cpu_set(cpu_id, cpu_callout_map);
 323                 Dprintk("After Callout %d.\n", cpu_id);
 324
 325                 /*
 326                  * Wait 5s total for a response
 327                  */
 328                 for (timeout = 0; timeout < 5000; timeout++) {
 329                         if (cpu_isset(cpu_id, cpu_callin_map))
 330                                 break;  /* It has booted */
 331                         udelay(1000);
 332                 }
 333
 334                 if (cpu_isset(cpu_id, cpu_callin_map)) {
 335                         /* number CPUs logically, starting from 1 (BSP is 0) */
 336                         Dprintk("OK.\n");
 337                 } else {
 338                         boot_status = 1;
 339                         printk("Not responding.\n");
 340                 }
 341         } else
 342                 printk("IPI never delivered???\n");
 343
 344         if (send_status || boot_status) {
 345                 unmap_cpu_to_physid(cpu_id, phys_id);
 346                 cpu_clear(cpu_id, cpu_callout_map);
 347                 cpu_clear(cpu_id, cpu_callin_map);
 348                 cpu_clear(cpu_id, cpu_initialized);
 349                 cpucount--;
 350         }
 351 }
 352
 353 int __devinit __cpu_up(unsigned int cpu_id)
 354 {
 355         int timeout;
 356
 357         cpu_set(cpu_id, smp_commenced_mask);
 358
 359         /*
 360          * Wait 5s total for a response
 361          */
 362         for (timeout = 0; timeout < 5000; timeout++) {
 363                 if (cpu_isset(cpu_id, cpu_online_map))
 364                         break;
 365                 udelay(1000);
 366         }
 367         if (!cpu_isset(cpu_id, cpu_online_map))
 368                 BUG();
 369
 370         return 0;
 371 }
 372
 373 void __init smp_cpus_done(unsigned int max_cpus)
 374 {
 375         int cpu_id, timeout;
 376         unsigned long bogosum = 0;
 377
 378         for (timeout = 0; timeout < 5000; timeout++) {
 379                 if (cpus_equal(cpu_callin_map, cpu_online_map))
 380                         break;
 381                 udelay(1000);
 382         }
 383         if (!cpus_equal(cpu_callin_map, cpu_online_map))
 384                 BUG();
 385
 386         for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
 387                 show_cpu_info(cpu_id);
 388
 389         /*
 390          * Allow the user to impress friends.
 391          */
 392         Dprintk("Before bogomips.\n");
 393         if (cpucount) {
 394                 for_each_cpu_mask(cpu_id, cpu_online_map)
 395                         bogosum += cpu_data[cpu_id].loops_per_jiffy;
 396
 397                 printk(KERN_INFO "Total of %d processors activated " \
 398                         "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
 399                         bogosum / (500000 / HZ),
 400                         (bogosum / (5000 / HZ)) % 100);
 401                 Dprintk("Before bogocount - setting activated=1.\n");
 402         }
 403 }
 404
 405 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 406 /* Activate a secondary processor Routins                                    */
 407 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 408
 409 /*==========================================================================*
 410  * Name:         start_secondary
 411  *
 412  * Description:  This routine activate a secondary processor.
 413  *
 414  * Born on Date: 2002.02.05
 415  *
 416  * Arguments:    *unused - currently unused.
 417  *
 418  * Returns:      void (cannot fail)
 419  *
 420  * Modification log:
 421  * Date       Who Description
 422  * ---------- --- --------------------------------------------------------
 423  * 2003-06-24 hy  modify for linux-2.5.69
 424  *
 425  *==========================================================================*/
 426 int __init start_secondary(void *unused)
 427 {
 428         cpu_init();
 429         preempt_disable();
 430         smp_callin();
 431         while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
 432                 cpu_relax();
 433
 434         smp_online();
 435
 436         /*
 437          * low-memory mappings have been cleared, flush them from
 438          * the local TLBs too.
 439          */
 440         local_flush_tlb_all();
 441
 442         cpu_idle();
 443         return 0;
 444 }
 445
 446 /*==========================================================================*
 447  * Name:         smp_callin
 448  *
 449  * Description:  This routine activate a secondary processor.
 450  *
 451  * Born on Date: 2002.02.05
 452  *
 453  * Arguments:    NONE
 454  *
 455  * Returns:      void (cannot fail)
 456  *
 457  * Modification log:
 458  * Date       Who Description
 459  * ---------- --- --------------------------------------------------------
 460  * 2003-06-24 hy  modify for linux-2.5.69
 461  *
 462  *==========================================================================*/
 463 static void __init smp_callin(void)
 464 {
 465         int phys_id = hard_smp_processor_id();
 466         int cpu_id = smp_processor_id();
 467         unsigned long timeout;
 468
 469         if (cpu_isset(cpu_id, cpu_callin_map)) {
 470                 printk("huh, phys CPU#%d, CPU#%d already present??\n",
 471                         phys_id, cpu_id);
 472                 BUG();
 473         }
 474         Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
 475
 476         /* Waiting 2s total for startup (udelay is not yet working) */
 477         timeout = jiffies + (2 * HZ);
 478         while (time_before(jiffies, timeout)) {
 479                 /* Has the boot CPU finished it's STARTUP sequence ? */
 480                 if (cpu_isset(cpu_id, cpu_callout_map))
 481                         break;
 482                 cpu_relax();
 483         }
 484
 485         if (!time_before(jiffies, timeout)) {
 486                 printk("BUG: CPU#%d started up but did not get a callout!\n",
 487                         cpu_id);
 488                 BUG();
 489         }
 490
 491         /* Allow the master to continue. */
 492         cpu_set(cpu_id, cpu_callin_map);
 493 }
 494
 495 static void __init smp_online(void)
 496 {
 497         int cpu_id = smp_processor_id();
 498
 499         local_irq_enable();
 500
 501         /* Get our bogomips. */
 502         calibrate_delay();
 503
 504         /* Save our processor parameters */
 505         smp_store_cpu_info(cpu_id);
 506
 507         cpu_set(cpu_id, cpu_online_map);
 508 }
 509
 510 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 511 /* Boot up CPUs common Routins                                               */
 512 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 513 static void __init show_mp_info(int nr_cpu)
 514 {
 515         int i;
 516         char cpu_model0[17], cpu_model1[17], cpu_ver[9];
 517
 518         strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
 519         strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
 520         strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
 521
 522         cpu_model0[16] = '\0';
 523         for (i = 15 ; i >= 0 ; i--) {
 524                 if (cpu_model0[i] != ' ')
 525                         break;
 526                 cpu_model0[i] = '\0';
 527         }
 528         cpu_model1[16] = '\0';
 529         for (i = 15 ; i >= 0 ; i--) {
 530                 if (cpu_model1[i] != ' ')
 531                         break;
 532                 cpu_model1[i] = '\0';
 533         }
 534         cpu_ver[8] = '\0';
 535         for (i = 7 ; i >= 0 ; i--) {
 536                 if (cpu_ver[i] != ' ')
 537                         break;
 538                 cpu_ver[i] = '\0';
 539         }
 540
 541         printk(KERN_INFO "M32R-mp information\n");
 542         printk(KERN_INFO "  On-chip CPUs : %d\n", nr_cpu);
 543         printk(KERN_INFO "  CPU model : %s/%s(%s)\n", cpu_model0,
 544                 cpu_model1, cpu_ver);
 545 }
 546
 547 /*
 548  * The bootstrap kernel entry code has set these up. Save them for
 549  * a given CPU
 550  */
 551 static void __init smp_store_cpu_info(int cpu_id)
 552 {
 553         struct cpuinfo_m32r *ci = cpu_data + cpu_id;
 554
 555         *ci = boot_cpu_data;
 556         ci->loops_per_jiffy = loops_per_jiffy;
 557 }
 558
 559 static void __init show_cpu_info(int cpu_id)
 560 {
 561         struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
 562
 563         printk("CPU#%d : ", cpu_id);
 564
 565 #define PRINT_CLOCK(name, value) \
 566         printk(name " clock %d.%02dMHz", \
 567                 ((value) / 1000000), ((value) % 1000000) / 10000)
 568
 569         PRINT_CLOCK("CPU", (int)ci->cpu_clock);
 570         PRINT_CLOCK(", Bus", (int)ci->bus_clock);
 571         printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
 572 }
 573
 574 /*
 575  * the frequency of the profiling timer can be changed
 576  * by writing a multiplier value into /proc/profile.
 577  */
 578 int setup_profiling_timer(unsigned int multiplier)
 579 {
 580         int i;
 581
 582         /*
 583          * Sanity check. [at least 500 APIC cycles should be
 584          * between APIC interrupts as a rule of thumb, to avoid
 585          * irqs flooding us]
 586          */
 587         if ( (!multiplier) || (calibration_result / multiplier < 500))
 588                 return -EINVAL;
 589
 590         /*
 591          * Set the new multiplier for each CPU. CPUs don't start using the
 592          * new values until the next timer interrupt in which they do process
 593          * accounting. At that time they also adjust their APIC timers
 594          * accordingly.
 595          */
 596         for (i = 0; i < NR_CPUS; ++i)
 597                 per_cpu(prof_multiplier, i) = multiplier;
 598
 599         return 0;
 600 }
 601
 602 /* Initialize all maps between cpu number and apicids */
 603 static void __init init_cpu_to_physid(void)
 604 {
 605         int  i;
 606
 607         for (i = 0 ; i < NR_CPUS ; i++) {
 608                 cpu_2_physid[i] = -1;
 609                 physid_2_cpu[i] = -1;
 610         }
 611 }
 612
 613 /*
 614  * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
 615  * else physical apic ids
 616  */
 617 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
 618 {
 619         physid_2_cpu[phys_id] = cpu_id;
 620         cpu_2_physid[cpu_id] = phys_id;
 621 }
 622
 623 /*
 624  * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
 625  * else physical apic ids
 626  */
 627 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
 628 {
 629         physid_2_cpu[phys_id] = -1;
 630         cpu_2_physid[cpu_id] = -1;
 631 }
 632